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3 letters and 1 booklet.
Letters from Sewell Alvin Knapp to Judge Charles Ernest Mack discuss business and the appointment of Mack to the board of directors of the Hawthorne Milling, Cyanide, and Mining Company. Also included is a sketch map of the Fortuna and Snowball Claims.
Progress reports from Holmes to Van Dyck Hubbard report on progress in sinking a shaft, assays of the ore, and machinery in use from December 25, 1879 - February 27, 1880.